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Wireless Power Transmission System(WPT) based on magnetic resonant method with up to 1kW power transmit capability through 10 to 30cm gap for charging battery installed on EV has completed for proving evaluation. Square type power Transmitt/Receive Couplers have used. To suppress near-by outside magnetic field, shiled plates have been attached. Simulation result of near-by magnetic field have been evaluated. The power transmit efficiency from output of 13.56MHz RF amp to the input of battery has achieved around 88%.

A new organic composite-coated steel sheet with bake-hardenability has been developed. The steel sheet consists of Zn-Ni alloy electroplated layer, chromate and zinc powder free organic film. To obtain better formability (anti-powdering) and weldability, the thickness of the organic film is reduced to 0.8∼1.5µm (1.0∼2.0g/m2). The addition of bake-hardenability to this organic coated steel sheet was realized by controlling the amount of residual solute carbon in continuous annealed extra low carbon steels.

A new organic composite-coated steel sheet “Zincrometal-KII” has been developed. The steel sheet consists of a specially improved thin zinc rich paint on Zn-Ni alley electroplated layer of low coating weight. Corrosion resistance, formability and weldability were investigated. (1) In two cyclic corrosion tests, consisting of salt spray, salt water immersion, drying and humidity, red rust initiation time of the flat part in unpainted condition of KII was about one and half times longer and its thickness reduction was reduced into less than about two third as compared to the conventional organic coated steel.